Learn About Indoor Air Quality
Practical guides on air purifiers, monitors, HEPA filters, wildfire smoke, and the science behind clean air. No jargon. No fluff. Just what you need to know.
Wildfire Smoke at Home: How to Seal Up and Run an Air Purifier
Why smoke is different from normal dust, which filters handle ultrafine PM2.5, and how to seal your home during fire season. Practical steps that work.
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Wildfire Smoke Air Quality Guide, What AQI Numbers Mean for Your Home
What AQI numbers mean, when to close windows, PM2.5 vs PM0.1, and a pre/during/post-event protocol for wildfire smoke season.
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HEPA vs Ionizer, Which Air Purifier Technology Actually Works?
HEPA is proven. Ionizers are mostly marketing. Some produce ozone. Here is the straight truth about filter technology, including Molekule's PECO claims.
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CADR Rating Explained, How to Size an Air Purifier
The only number that matters when buying a purifier. What CADR means, the 2/3 rule, why room size claims are inflated, and a complete sizing table.
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Best Air Quality Monitors, What to Measure and Why
PM2.5, CO2, VOCs, radon, humidity. What each sensor tracks, what the numbers mean, and which monitor is worth your money. Measure first, buy second.
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How to Test Your Indoor Air Quality (4 Steps, Starting Free)
From a free smell check to a lab test, here is how to find out what is in your home's air.
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Airthings vs Govee: Is the Extra Cost Worth It?
Govee monitors PM2.5 and temp. Airthings monitors radon, VOCs, CO2, PM2.5, temp, and humidity. Here is when the difference matters.
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Radon Mitigation Cost by System and Foundation Type
What a radon fix costs for a slab, a basement or a crawl space, and how to find a certified contractor.
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Air Purifiers in a Radon Home, What They Can and Cannot Do
An air purifier does not remove radon gas. Here is why mitigation comes first and where a HEPA unit still helps.
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CO Detector vs CO2 Monitor, Two Different Gases
Carbon monoxide and carbon dioxide are not the same thing. A CO2 monitor does not replace a CO alarm.
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Air Doctor Review, 5500i, 3500i and 2500 Compared
Air Doctor against Coway and IQAir on published CADR, room coverage and filter cost.
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Spring Allergy Air Purifier Guide
A pollen calendar by region and HEPA picks sized for tree, grass and weed pollen.
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What Is AQI? The Six Levels in Plain Words
How to read an AQI number, which pollutants it covers and what to do at each level.
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How to Check AQI by Zip Code
Where to look up air quality for your zip code, plus typical AQI for the 20 largest US metro areas.
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How AQI Is Calculated, Breakpoints and Sensors
The math behind the AQI number, what each pollutant means and why PurpleAir and AirNow can disagree.
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